| Popis: |
We report the synthesis of gold nanoparticles of controllable size and morphology from ordered mesophasetemplates comprised of iso-octane, sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and lecithin along withan aqueous phase containing auric acid (HAuCl4), the gold precursor. Highly facettednanoparticles are formed by the reduction of HAuCl4 directly by the dioctyl sulfosuccinatetermini of AOT. In sharp contrast, rapid reduction of the gold precursor by the addition of sodium borohydrideNaBH4 in the aqueous phase results in spherical nanoparticles. The size of the nanoparticlescan be adjusted by varying the auric acid concentration as well as the volume fraction of the aqueous phase.The value of this technique is the ease with which nanoscale particles of different shape and size can beformed, with concomitant impact on their physical and chemical properties. |
